Perma Pure Modular Board User Manual
Page 7
Analog out 1 is controlled by the temperature measured from thermocouple #1.
Each control board has two field replaceable relays.
Relay 1 is activated when the active impinger temperature is below the user set
‘Ready’ temperature. The relay does not deactivate until the impinger temperature
rises to 0.5 °C above the ‘Ready’ temperature. This hysteresis is set to avoid relay
chatter when the impinger is near the set temperature. The source for the ‘Ready’
relay will change depending on which of the impingers, 1
st
or 2
nd
frozen, is active.
Relay 2 controls the valve used to control the sample flow to the frozen
impingers. The relay is activated when the 2
nd
frozen impinger is active.
Both relays have two sets of contacts. The standard factory wiring uses one set of
contacts. The second set of contacts is available for field wiring by the user.
2
nd
Frozen
The impinger temperature is available as a voltage output equal to 0.1 V / °C.
Analog out 1 is controlled by the temperature measured from thermocouple #1.
Each control board has two field replaceable relays.
Relay 1 is activated when the 2
nd
frozen impinger temperature is below the user
set ‘Ready’ temperature. The relay does not deactivate until the impinger
temperature rises to 0.5 °C above the ‘Ready’ temperature. This hysteresis is set
to avoid relay chatter when the impinger is near the set temperature.
Relay 2 is not used
Neither relay is factory wired.
Dual Channel Cooler
The impinger temperatures are available as a voltage output equal to 0.1 V / °C.
Analog out 1 is controlled by the temperature measured from thermocouple #1.
Analog out 2 is controlled by the temperature measured from thermocouple #2.
Each control board has two field replaceable relays.
Relay 1 is activated when the impinger temperature channel 1 is below the user
set ‘Ready’ temperature. The relay does not deactivate until the impinger
temperature rises to 0.5 °C above the ‘Ready’ temperature. This hysteresis is set
to avoid relay chatter when the impinger is near the set temperature.
Relay 2 is activated when the impinger temperature channel 2 is below the user
set ‘Ready’ temperature. The relay does not deactivate until the impinger